Some foods can make you sick if they are stored in conditions that are not cold enough to prevent the growth of harmful organisms. Freezing can keep some foods in good condition for months after the growing season. Yet foods can be damaged if they are kept too cold.

The British Development Group says the best time to prepare foods for storage is at harvest time while foods are still in the field.

Use a sharp knife and place the harvested items on a clean surface or directly into storage containers. Do not put them on the ground.

Use clean water to remove dirt, and keep the water clean. Usually it is better not to remove outer leaves from fruits and vegetables before storage. Without leaves, foods can become dry quickly.

Fruits and vegetables must cool from field heat before they are put into storage containers. Cooling them in water can spread funguses (霉菌) throughout the food. A better idea is to harvest foods either early or late in the day, and then leave them to cool naturally.

Some fruits and vegetables must be stored at zero to four degrees Celsius. Some foods need to be stored at four to eight degrees Celsius, and some need to be stored above eight degrees Celsius for best results.

Wet fruits and vegetables so they do not become too dry. The best time to do this is before storage. Cover the items in plastic once they reach the right temperature for storage. Most fruits and vegetables need the relative humidity (湿度). Finally, leave spaces between the food containers and the walls of the cold storage area so air can flow. Keep the spaces clean. And try not to open the doors too often.

64. The text is mainly about                 .

     A. the benefits of storing foods in cold conditions

     B. some tips for the storage of foods

     C. the research on some fruits and vegetables

     D. the process of keeping foods in good condition

65. What is the function of the leaves of fruits and vegetables?

     A. Keeping them from harmful organisms.               B. Helping keep them clean.

     C. Helping keep them fresh.                            D. Making them look more attractive.

66. Why is it better to harvest foods either early or late in the day?

     A. Because foods have no field heat then.

     B. Because it is easy to make them become cool from field heat naturally.

     C. Because foods then are wet enough to be stored.

     D. Because foods are cleaner then.

Energy is very important in modern life. People use energy to run machines, heat and cool their homes, cook, give light, and transport people and products from place to place. Most energy comes from fossil fuels—petroleum, coal, and natural gas. However, burning fuels causes pollution. Also, if we don’t find new kinds of energy, we will use up all the fossil fuels in the twenty-first century. Scientists are working hard to find other kinds of energy for the future. What might these sources of energy be?
Energy from the wind
All over the world, people use the power of the wind. It turns windmills and moves sailboats. It is a clean source of energy, and there is lots of it. Unfortunately, if the wind does not blow, there is no wind energy.
Energy from water
When water moves from a high place to a lower place, it makes energy. This energy is used to create electricity. In Brittany, France, for example, waterpower produces enough energy to light a town of 40,000people. Waterpower gives energy without pollution. However, people have to build dams to use this energy. Dams cost a lot of money, so water energy is expensive.
Energy from the earth
There is heat in rocks under the earth. Scientists use this heat to make geothermal energy. San Francisco gets half of the energy it needs from geothermal power. This kind of energy is cheap, but it is possible only in a few places in the world.
Energy from the sun
Solar panels on the roofs of houses can turn energy from the sun into electricity. These panels can create enough energy to heat an entire house. Solar power is clean and there is a lot of it in sunny places. But when the weather is bad, there is no sunlight for energy.
【小题1】What does this passage mainly talk about?

A．In order to protect our environment, we should try other kinds of energy.

B．All scientists in the world will unite to find energy.

C．People in modern life use energy every day.

D．Energy changes people’s lives.

Energy is very important in modern life. People use energy to run machines, heat and cool their homes, cook, give light, and transport people and products from place to place. Most energy comes from fossil fuels—petroleum, coal, and natural gas. However, burning fuels causes pollution. Also, if we don’t find new kinds of energy, we will use up all the fossil fuels in the twenty-first century. Scientists are working hard to find other kinds of energy for the future. What might these sources of energy be?
Energy from the wind
All over the world, people use the power of the wind. It turns windmills and moves sailboats. It is a clean source of energy, and there is lots of it. Unfortunately, if the wind does not blow, there is no wind energy.
Energy from water
When water moves from a high place to a lower place, it makes energy. This energy is used to create electricity. In Brittany, France, for example, waterpower produces enough energy to light a town of 40,000people. Waterpower gives energy without pollution. However, people have to build dams to use this energy. Dams cost a lot of money, so water energy is expensive.
Energy from the earth
There is heat in rocks under the earth. Scientists use this heat to make geothermal energy. San Francisco gets half of the energy it needs from geothermal power. This kind of energy is cheap, but it is possible only in a few places in the world.
Energy from the sun
Solar panels on the roofs of houses can turn energy from the sun into electricity. These panels can create enough energy to heat an entire house. Solar power is clean and there is a lot of it in sunny places. But when the weather is bad, there is no sunlight for energy.
【小题1】What does this passage mainly talk about?